California's unusual sea visitors signal a bigger climate story, with potential consequences for India's monsoon, farmers, fisheries and marine life.
Off Dana Point in California, the sea is delivering visitors that normally belong much farther south. Last month, a longfin bigeye fish was spotted in the state for the first time. Sea turtles nested on California beaches for the first time, while a venomous yellow-bellied sea snake swam ashore and whale sharks and hammerheads cruised close to the coast. According to Reuters, the cause is an unusually strong El Niño.
El Niño is a periodic warming of surface waters in the central and eastern equatorial Pacific, recurring every few years. Normally, trade winds push warm water westward towards Asia and Australia. During El Niño, these winds weaken, allowing warm water to spread eastward and, along the American coast, northward. Tropical marine species move with it.
California had already experienced a marine heatwave before this El Niño arrived. The event also coincided with a series of hurricanes in the eastern Pacific. These contributed to rising sea levels and powerful waves that damaged homes and stripped some Southern California beaches of sand. The state has declared an emergency.
The same event has created two very different outcomes. For sportfishing businesses such as Dana Wharf, it has been a windfall. Co-owner Donna Kalez said anglers have landed 5,000 yellowfin tuna this year, compared with just two a year ago. For coastal residents, however, the consequences have included damaged homes and eroded shores. Experts expect conditions to mostly return to normal after El Niño passes next year, although more unusual marine species may arrive before then.
Why California's Changing Waters Matter to India
For India, this is no distant curiosity. El Niño is among the most consequential influences on Indian weather. A warmer eastern Pacific can shift atmospheric circulation away from the subcontinent, weakening the monsoon in many, though not all, El Niño years.
India's experience offers several examples. Rainfall was deficient in 2009 and 2015, while the 2023 monsoon also ended below normal. However, the strong El Niño of 1997 shows why the relationship is not straightforward. A favourable Indian Ocean Dipole, which describes the difference in sea-surface temperatures between the western and eastern Indian Ocean, helped offset the adverse influence of El Niño, and India's monsoon rainfall remained normal.
The stakes are high because roughly half of India's net sown area depends on rainfall rather than irrigation. A weak monsoon can reduce the production of kharif crops such as rice, pulses and oilseeds. Lower output can tighten food supplies, push up prices and reduce rural incomes. Agriculture continues to support more than four in ten Indian workers, making monsoon performance an important factor in the wider economy.
India's Marine Ecosystems Face Their Own Risks
The effects of ocean warming extend beyond rainfall. India's coastal waters and marine ecosystems are also vulnerable to changes in sea-surface temperatures.
Coral bleaching in Lakshadweep, the Gulf of Mannar and the Andaman and Nicobar Islands was recorded during strong El Niño years, including 1998, 2010 and 2016. When water temperatures remain unusually high, corals become stressed and may expel the algae that provide much of their food and colour. Prolonged heat can cause widespread coral damage, threatening marine biodiversity and the communities that depend on reef ecosystems.
Changes in ocean temperatures can also influence the distribution of commercially important fish. Oil sardines and mackerel, for example, may change their movement and availability off the Kerala and Karnataka coasts as marine conditions shift. Such changes can affect fishing yields, household incomes and local seafood markets.
Even sea turtles are vulnerable to rising temperatures. The temperature of the sand in which their eggs incubate influences the sex of hatchlings. Warmer sand generally produces more females, raising concerns about the long-term balance of turtle populations, including olive ridleys that nest along Odisha's coast.
These effects do not occur uniformly during every El Niño event. Their severity depends on the duration and intensity of warming, local ocean conditions and other environmental factors. Nevertheless, they underline why monitoring marine temperatures is important for India's coastal states.
Better Observation Can Improve Preparedness
One feature of the California story deserves attention. The Reuters report notes that unusual marine sightings have become more evident with the growing use of drone and video technology. Nate Jaros of the Aquarium of the Pacific also describes the excitement among fishermen as unfamiliar species appear in local waters.
Observation is an important part of understanding changing marine conditions. India already has institutions that can help. The India Meteorological Department tracks El Niño and issues monsoon outlooks, while the Indian National Centre for Ocean Information Services (INCOIS), based in Hyderabad, provides ocean information and fishing advisories.
The effectiveness of these systems can improve when scientific monitoring is combined with observations from fishing communities. Fishers regularly spend hours at sea and can notice changes in species, catch locations and water conditions before those changes become apparent in broader assessments.
A fisherman reporting an unfamiliar species or an unusual shift in fish availability is therefore doing more than sharing an observation. With proper documentation and verification, that information can contribute to a wider understanding of marine ecosystems.
What India Should Do Before the Next El Niño
Preparedness must go beyond forecasting. Early warnings can give state governments time to prepare contingency crop plans, review reservoir storage, strengthen buffer stocks of cereals and pulses, and improve the speed of crop insurance assessments.
Coastal states can use sea-surface temperature information alongside fishing advisories to help fishing communities respond to changing conditions. Regular monitoring of coral reefs, turtle-nesting beaches and other sensitive habitats can also help authorities identify emerging threats.
Farmers need timely, locally relevant advice on crop choices, sowing schedules and water conservation when rainfall prospects deteriorate. Fishing communities, meanwhile, need reliable information about ocean conditions and the likely movement of fish stocks. Better coordination between scientific institutions, state governments and local communities can help translate forecasts into practical decisions.
No preparedness measure can prevent El Niño. However, timely information and coordinated action can reduce its economic and environmental costs.
The Pacific's Heat Does Not Stay in the Pacific
El Niño is a natural climate cycle, but it now unfolds against a background of long-term global warming. Rising ocean temperatures can increase the baseline from which individual climate events develop, adding pressure to marine ecosystems already facing environmental change.
California's unusual marine visitors are therefore more than a spectacle. They offer a reminder that ocean conditions are connected to atmospheric circulation, marine biodiversity and livelihoods across distant regions.
For India, the implications reach from the monsoon-dependent farms of the interior to fishing communities along the coast. Understanding these connections, improving observation and acting on early warnings will be essential to reducing the risks.
The Pacific's heat does not stay in the Pacific. India's farms, coasts and fish markets may feel its effects long after California's unusual visitors have disappeared.
Off Dana Point in California, the sea is delivering visitors that normally belong much farther south. Last month, a longfin bigeye fish was spotted in the state for the first time. Sea turtles nested on California beaches for the first time, while a venomous yellow-bellied sea snake swam ashore and whale sharks and hammerheads cruised close to the coast. According to Reuters, the cause is an unusually strong El Niño.
El Niño is a periodic warming of surface waters in the central and eastern equatorial Pacific, recurring every few years. Normally, trade winds push warm water westward towards Asia and Australia. During El Niño, these winds weaken, allowing warm water to spread eastward and, along the American coast, northward. Tropical marine species move with it.
California had already experienced a marine heatwave before this El Niño arrived. The event also coincided with a series of hurricanes in the eastern Pacific. These contributed to rising sea levels and powerful waves that damaged homes and stripped some Southern California beaches of sand. The state has declared an emergency.
The same event has created two very different outcomes. For sportfishing businesses such as Dana Wharf, it has been a windfall. Co-owner Donna Kalez said anglers have landed 5,000 yellowfin tuna this year, compared with just two a year ago. For coastal residents, however, the consequences have included damaged homes and eroded shores. Experts expect conditions to mostly return to normal after El Niño passes next year, although more unusual marine species may arrive before then.
Why California's Changing Waters Matter to India
For India, this is no distant curiosity. El Niño is among the most consequential influences on Indian weather. A warmer eastern Pacific can shift atmospheric circulation away from the subcontinent, weakening the monsoon in many, though not all, El Niño years.
India's experience offers several examples. Rainfall was deficient in 2009 and 2015, while the 2023 monsoon also ended below normal. However, the strong El Niño of 1997 shows why the relationship is not straightforward. A favourable Indian Ocean Dipole, which describes the difference in sea-surface temperatures between the western and eastern Indian Ocean, helped offset the adverse influence of El Niño, and India's monsoon rainfall remained normal.
The stakes are high because roughly half of India's net sown area depends on rainfall rather than irrigation. A weak monsoon can reduce the production of kharif crops such as rice, pulses and oilseeds. Lower output can tighten food supplies, push up prices and reduce rural incomes. Agriculture continues to support more than four in ten Indian workers, making monsoon performance an important factor in the wider economy.
India's Marine Ecosystems Face Their Own Risks
The effects of ocean warming extend beyond rainfall. India's coastal waters and marine ecosystems are also vulnerable to changes in sea-surface temperatures.
Coral bleaching in Lakshadweep, the Gulf of Mannar and the Andaman and Nicobar Islands was recorded during strong El Niño years, including 1998, 2010 and 2016. When water temperatures remain unusually high, corals become stressed and may expel the algae that provide much of their food and colour. Prolonged heat can cause widespread coral damage, threatening marine biodiversity and the communities that depend on reef ecosystems.
Changes in ocean temperatures can also influence the distribution of commercially important fish. Oil sardines and mackerel, for example, may change their movement and availability off the Kerala and Karnataka coasts as marine conditions shift. Such changes can affect fishing yields, household incomes and local seafood markets.
Even sea turtles are vulnerable to rising temperatures. The temperature of the sand in which their eggs incubate influences the sex of hatchlings. Warmer sand generally produces more females, raising concerns about the long-term balance of turtle populations, including olive ridleys that nest along Odisha's coast.
These effects do not occur uniformly during every El Niño event. Their severity depends on the duration and intensity of warming, local ocean conditions and other environmental factors. Nevertheless, they underline why monitoring marine temperatures is important for India's coastal states.
Better Observation Can Improve Preparedness
One feature of the California story deserves attention. The Reuters report notes that unusual marine sightings have become more evident with the growing use of drone and video technology. Nate Jaros of the Aquarium of the Pacific also describes the excitement among fishermen as unfamiliar species appear in local waters.
Observation is an important part of understanding changing marine conditions. India already has institutions that can help. The India Meteorological Department tracks El Niño and issues monsoon outlooks, while the Indian National Centre for Ocean Information Services (INCOIS), based in Hyderabad, provides ocean information and fishing advisories.
The effectiveness of these systems can improve when scientific monitoring is combined with observations from fishing communities. Fishers regularly spend hours at sea and can notice changes in species, catch locations and water conditions before those changes become apparent in broader assessments.
A fisherman reporting an unfamiliar species or an unusual shift in fish availability is therefore doing more than sharing an observation. With proper documentation and verification, that information can contribute to a wider understanding of marine ecosystems.
What India Should Do Before the Next El Niño
Preparedness must go beyond forecasting. Early warnings can give state governments time to prepare contingency crop plans, review reservoir storage, strengthen buffer stocks of cereals and pulses, and improve the speed of crop insurance assessments.
Coastal states can use sea-surface temperature information alongside fishing advisories to help fishing communities respond to changing conditions. Regular monitoring of coral reefs, turtle-nesting beaches and other sensitive habitats can also help authorities identify emerging threats.
Farmers need timely, locally relevant advice on crop choices, sowing schedules and water conservation when rainfall prospects deteriorate. Fishing communities, meanwhile, need reliable information about ocean conditions and the likely movement of fish stocks. Better coordination between scientific institutions, state governments and local communities can help translate forecasts into practical decisions.
No preparedness measure can prevent El Niño. However, timely information and coordinated action can reduce its economic and environmental costs.
The Pacific's Heat Does Not Stay in the Pacific
El Niño is a natural climate cycle, but it now unfolds against a background of long-term global warming. Rising ocean temperatures can increase the baseline from which individual climate events develop, adding pressure to marine ecosystems already facing environmental change.
California's unusual marine visitors are therefore more than a spectacle. They offer a reminder that ocean conditions are connected to atmospheric circulation, marine biodiversity and livelihoods across distant regions.
For India, the implications reach from the monsoon-dependent farms of the interior to fishing communities along the coast. Understanding these connections, improving observation and acting on early warnings will be essential to reducing the risks.
The Pacific's heat does not stay in the Pacific. India's farms, coasts and fish markets may feel its effects long after California's unusual visitors have disappeared.
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